What was found
DURING C-18 CHECK, A 3/8 INCH CRACK WAS FOUND ON LOWER FORWARD CORNER OF L-1 DOOR AT LOWER GATE BEAM WEB, BS 314, STR 16 LT. MAINTENANCE CUTOUT DAMAGE IN LOWER GATE BEAM WEB OF L-1 DOOR; FABRICATED A REPAIR DOUBLER AND FILLERS; INSTALLED REPAIR PARTS IAW B737-300 SRM 51-70-13, FIG 1.